Let’s get back on path here.
The question is can Protestant’s get to heaven without confession. This question is not applicable in the same way to the Orthodox since they retain Apostolic succession and valid Holy Orders and believe in the same view of the economy of salvation that apply to Catholics. The Orthodox therefore have no impediments to Heaven that are not shared by Catholics.
The reason that Orthodoxy came up at all is that JonNC stated that if the Orthodox came into full communion with Rome, then he would know that it was the one true faith and would immediately join RCIA. I pointed out that 30% of the Eastern Churchs were already in full communion with Rome but in retrospect, I think this misses the real point. In terms of what it takes to get to heaven, the Orthodox and Catholic Church are in full agreement, regardless of their views of the primacy of The Pope. And that is what really should rule the day. If Jon would join the Orthodox in his quest for the truth, he would be much closer to Catholicism than he is as a Lutheran and would have no impediments to salvation. We don’t care what he calls himself, we just want him to enter heaven.
As for Protestants, they too have a path to heaven, but its through the Catholic Church. Its not that they have to actually join the Catholic Church bodily, although that would be the surest path. What they have to do is what the Church teaches. They must be baptized and enter the state of grace. True Christians do that. Then they have to stay in the state of grace until death. Whether they call themselves Catholic or not, this means loving God and Neighbor and avoiding mortal sin. Most Christians would recognize the goal of Christianity is to love so being a Christian of any stripe is helpful toward salvation. True, they deprive themselves of the sacramental sources of grace that would help them do this, but yet it is still open to them. And of course, if they do commit mortal sin, without sacramental confession, they need to achieve perfect contrition (the sorrow of sins solely because they offend God) whereas a Catholic can be absolved with imperfect contrition if he is willing to confess sacramentally. This is a high hurdle of course, but again, not impossible.
The more I think about this vexing problem, the more I recognize that for many, Protestant Christianity is indeed a path to the fullness of Truth that exists in the Catholic Church. Just look at how many converts are on this website. For many, their faith journey started in non=Catholic Christianity and as they continued to search for the whole truth, they found their way home to Rome. Even if they never make that final conversion, the hope is that they get close enough that they will achieve perfect contrition on their deathbed and join in the love that Jesus offers.